I’m not betting on Steam disappearing in the next ten years. I probably wouldn’t even bet that they’ll disappear in my lifetime. But, they could, anything could happen, and then you don’t have that library anymore. Physical is the only way to truly own.
That’s a strange point, imho. We disagree on what own means. You being bad with your physical media doesn’t mean you didn’t more truthfully own it. We will have to agree to disagree, have a nice day.